4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/lvfs/lvfs_lib.c
38 * Lustre filesystem abstraction routines
40 * Author: Andreas Dilger <adilger@clusterfs.com>
43 #include <linux/module.h>
45 #include <liblustre.h>
47 #include <lustre_lib.h>
48 #include <lprocfs_status.h>
50 unsigned int obd_alloc_fail_rate = 0;
52 int obd_alloc_fail(const void *ptr, const char *name, const char *type,
53 size_t size, const char *file, int line)
56 (cfs_rand() & OBD_ALLOC_FAIL_MASK) < obd_alloc_fail_rate) {
57 CERROR("%s%salloc of %s ("LPU64" bytes) failed at %s:%d\n",
58 ptr ? "force " :"", type, name, (__u64)size, file,
60 CERROR(LPU64" total bytes and "LPU64" total pages "
61 "("LPU64" bytes) allocated by Lustre, "
62 "%d total bytes by LNET\n",
64 obd_pages_sum() << CFS_PAGE_SHIFT,
66 cfs_atomic_read(&libcfs_kmemory));
71 EXPORT_SYMBOL(obd_alloc_fail);
74 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
76 struct lprocfs_counter *percpu_cntr;
77 struct lprocfs_counter_header *header;
79 unsigned long flags = 0;
84 /* With per-client stats, statistics are allocated only for
85 * single CPU area, so the smp_id should be 0 always. */
86 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
90 header = &stats->ls_cnt_header[idx];
91 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
92 percpu_cntr->lc_count++;
94 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
96 * lprocfs_counter_add() can be called in interrupt context,
97 * as memory allocation could trigger memory shrinker call
98 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
101 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
102 * flag, because it needs accurate counting lest memory leak
103 * check reports error.
105 if (cfs_in_interrupt() &&
106 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
107 percpu_cntr->lc_sum_irq += amount;
109 percpu_cntr->lc_sum += amount;
111 if (header->lc_config & LPROCFS_CNTR_STDDEV)
112 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
113 if (amount < percpu_cntr->lc_min)
114 percpu_cntr->lc_min = amount;
115 if (amount > percpu_cntr->lc_max)
116 percpu_cntr->lc_max = amount;
118 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
120 EXPORT_SYMBOL(lprocfs_counter_add);
122 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
124 struct lprocfs_counter *percpu_cntr;
125 struct lprocfs_counter_header *header;
127 unsigned long flags = 0;
132 /* With per-client stats, statistics are allocated only for
133 * single CPU area, so the smp_id should be 0 always. */
134 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
138 header = &stats->ls_cnt_header[idx];
139 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
140 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
142 * Sometimes we use RCU callbacks to free memory which calls
143 * lprocfs_counter_sub(), and RCU callbacks may execute in
144 * softirq context - right now that's the only case we're in
145 * softirq context here, use separate counter for that.
148 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
149 * flag, because it needs accurate counting lest memory leak
150 * check reports error.
152 if (cfs_in_interrupt() &&
153 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
154 percpu_cntr->lc_sum_irq -= amount;
156 percpu_cntr->lc_sum -= amount;
158 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
160 EXPORT_SYMBOL(lprocfs_counter_sub);
162 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
164 struct lprocfs_counter *cntr;
165 unsigned int percpusize;
167 unsigned long flags = 0;
170 LASSERT(stats->ls_percpu[cpuid] == NULL);
171 LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
173 percpusize = lprocfs_stats_counter_size(stats);
174 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
175 if (stats->ls_percpu[cpuid] != NULL) {
177 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
178 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
179 spin_lock_irqsave(&stats->ls_lock, flags);
181 spin_lock(&stats->ls_lock);
182 if (stats->ls_biggest_alloc_num <= cpuid)
183 stats->ls_biggest_alloc_num = cpuid + 1;
184 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
185 spin_unlock_irqrestore(&stats->ls_lock, flags);
187 spin_unlock(&stats->ls_lock);
190 /* initialize the ls_percpu[cpuid] non-zero counter */
191 for (i = 0; i < stats->ls_num; ++i) {
192 cntr = lprocfs_stats_counter_get(stats, cpuid, i);
193 cntr->lc_min = LC_MIN_INIT;
199 EXPORT_SYMBOL(lprocfs_stats_alloc_one);
202 EXPORT_SYMBOL(obd_alloc_fail_rate);